installation guide - s3-ap-southeast-2.amazonaws.com · technical details fs65 a4265-2.3 hbm:...

Installation Guide

English

FS65Accelerometer

Hottinger Baldwin Messtechnik GmbH

Im Tiefen See 45

D-64239 Darmstadt

Tel. +49 6151 803-0

Fax +49 6151 803-9100

[email protected]

www.hbm.com

HBM FiberSensing, S.A.

Optical Business

Rua Vasconcelos Costa, 277

4470-640 Maia

Portugal

Tel. +351 229 613 010

Fax +351 229 613 020

[email protected]

www.hbm.com/fs

Mat.: 7-2002.4265

DVS: A4265-2.3 HBM: public

05.2015

Sensor Design Version: v1.0

� Hottinger Baldwin Messtechnik GmbH.

Subject to modifications.

All product descriptions are for general information only.

They are not to be understood as a guarantee of quality or

durability.

FS65 A4265-2.3 HBM: public 3

English

1 Technical Details 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.1 General Information 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.1.1 Overview 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.1.2 Characteristics 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.1.3 Applications 5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.1.4 Quality 6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.1.5 Accessories 6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.2 General Specifications 7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2 Sensor Installation 8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.1 Accelerometer 8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.1.1 List of Materials 8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.1.2 Placing the Sensor 9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.1.3 Fixing the Sensor 10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.1.4 Protecting the Sensor 10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.2 Bi or Triaxial Accelerometer 11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.2.1 List of Materials 11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.2.2 Assembling the Sensors 12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.2.3 Fixing the Assembly 20. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.2.4 Protecting the Sensors 20. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3 Sensor Configuration 22. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3.1 Sensor Calibration Sheet 22. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3.1.1 General nformation 23. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3.1.2 Calibration Data 23. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3.1.3 Acceleration Computation 23. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Technical Details

4 A4265-2.3 HBM: public FS65

1 Technical Details

1.1 General Information

This installation guide applies to the following products:

Part Number Description

K-FS65-30-11-302 FS65 - Accelerometer • Outdoor • FC/APC

K-FS65-30-13-302 FS65 - Accelerometer • Outdoor • SC/APC

K-FS65-30-10-302 FS65 - Accelerometer • Outdoor • NC

1.1.1 Overview

The FS65 - Accelerometer is a Fiber Bragg Grating

(FBG) based sensor, suitable for a large range of appli

cations where low frequency and small amplitude vibra

tions are present.

1.1.2 Characteristics

: Robustness

Long-term reliability ensured by innovative sensor

design, careful selection of materials and IP68 packag

ing.

: Completely passive

Inherent immunity to all electromagnetic effects (EMI,

RFI, sparks, etc.) and safe operation in hazardous envi

ronments.

Technical Details


: High multiplexing capability

Connection of a large number of sensors to a single opti

cal fiber, reducing network and installation complexity.

: Remote sensing

Large distance between sensors and interrogator (sev

eral kilometers).

: Compatible with most interrogators

Provided with calibration sheet, allowing easy and accu

rate configuration.

: Self-referenced

Based on the measurement of an absolute parameter -

the Bragg wavelength - independent of power fluctua

tions.

1.1.3 Applications

HBM FiberSensing accelerometer can be used in a large

range of monitoring applications, including measuring

ambient induced vibration of civil structures.

: Civil Engineering

: Energy

: R&D

Technical Details


1.1.4 Quality

All HBM FiberSensing's processes are strictly controlledfrom development to production. Each product is sub

jected to high standard performance and endurance

tests, individually calibrated and checked before ship

ping.

HBM FiberSensing, S.A. concentrates all optical sensing

activity of HBM and is an ISO 9001:2008 certified com

pany.

1.1.5 Accessories

The implementation of complex sensing networks in large

structures is made simpler with HBM FiberSensing

accessories. These include cables especially designed to

resist harsh environments as in civil engineering, not onlyduring construction, but also during the lifetime of the

structure (humidity, corrosion, etc.).

HBM FiberSensing also provides accessories for compact in series mounting of two or three accelerometers in

transversal directions, allowing the simultaneous mea

surement of vibration along multiple axis.

Technical Details


1.2 General Specifications

Sensor

Sensitivity1) 75 pm/g @ 40 Hz

Measurement range ±10 g

Frequency range 0 to 50 Hz

Resonance frequency1) 430 Hz

Flatness < 2%

Resolution2)12.5 μg/�Hz

Maximum calib. error ±0.1 g @ 40 Hz

Transverse sensitivity < 0.1%

Optical

Central wavelength 1500 to 1600 nm

Spectral width (FWHM) < 0.2 nm

Reflectivity > 65%

Side lobe suppression > 10 dB

Inputs / Outputs

Cable type Ø 3 mm outdoor (armor)

Cable length 2 m each side (±5 cm)

Connectors FC/APC

SC/APC

NC (No Connectors)

Environmental

Operation temperature -20 to 80 ºC

Protection class IP68

Mechanical

Materials Aluminum

Dimensions 73 x Ø 53 mm

Weight 250 g

1) Typical values2) For 1 pm resolution in wavelength measurement

Sensor Installation


2 Sensor Installation

2.1 Accelerometer

2.1.1 List of Materials

Included Material

Accelerometer

List of Needed Equipment

The needed tools to install the FS65 - Accelerometer

depend on the structure the sensor is to be installed on.

In many cases, mounting parts may need to be designed

in order to adapt the sensor to the spot where it is going

to be installed.

The installation solution should be carefully designed in

order to meet the sensor measuring direction and the

structure characteristics.

Sensor Installation


2.1.2 Placing the Sensor

The FS65 - Accelerometers can be placed headed up,headed down or towards the side (Fig. 2.1).

ÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓ

ÔÔÔÔÔÔÔÔÔÔÔÔÔÔÔÔÔÔÔÔÔÔÔÔÔÔÔÔÔÔÔÔÔÔÔÔÔÔÔÔÔÔÔÔÔÔÔÔÔÔÔÔÔÔÔÔÔÔÔÔÔÔÔÔÔ

Fig. 2.1

Information

This will only alter the sensor's DC output. Dynamically, it

will still have the same behavior.

Its position must be set according to its measuring direc

tion.

Sensor Installation


measuring

direction

Fig. 2.2

2.1.3 Fixing the Sensor

The Accelerometer has a M5 hole on its basis to be

screwed to the surface.

2.1.4 Protecting the Sensor

Accelerometer is IP68 rated, meaning that no protection

is needed. Nevertheless, it can be protected with a box

or other protection methods.

Sensor Installation


2.2 Bi or Triaxial Accelerometer

2.2.1 List of Materials

Included Material

� Accelerometers

� Mounting Plate:

- 1x Plate

- 1x Positioning Block

- 4x Cable Guide

- 8x M3x6

- 2x M5x8

- 4x M5x12

- 4x M6x20

� Protection Cover (optional):

- 1x Cover

- 8x M6x20

List of Needed Equipment

The needed tools to install the FS65 - Accelerometer

depend on the structure the sensor will be installed. In

many cases, mounting parts may need to be designed in

order to adapt the sensor to the spot where it is going tobe installed.

The installation solution should be carefully designed in

order to meet the sensor measuring direction and thestructure characteristics.

Sensor Installation


2.2.2 Assembling the Sensors

The Bi or Triaxial Accelerometer is assembled on amounting base using two or three accelerometers.

Its position must be set according to its measuring direc

tion. On Fig. 2.3 an example of the possible two measur

ing directions is presented and on Fig. 2.4 a Triaxialassembly is presented.

measuring

directions

Fig. 2.3

measuring

directions

Fig. 2.4

Sensor Installation


Preparing the Mounting Plate

Mechanical parts of the mounting plate are delivered

separately.

Start by screwing the position block to the mounting plate

using 3 of the provided M5x12 screws. These screws

should be threaded from the backside as shown on

Fig. 2.5.

Mounting plate

M5x12

Fig. 2.5

Position block

Fig. 2.6

Sensor Installation


Fixing the Sensors

On the horizontal axis, use the provided M5x8 screws to

fix the accelerometer to the positioning block.

Ensure that the fibers are oriented at approximately 30º,

with the fibers that will be exiting the protection cover at

the lower position (see Fig. 2.7 and Fig. 2.8).

M5x8

Fig. 2.7

Approx. 30°

Fig. 2.8

Fig. 2.9

Sensor Installation


For the vertical axis sensor, use the remaining M5x12screw.

Place the vertical sensor with the fibers oriented at 45º

(Fig. 2.12).

M5x12

Fig. 2.10

Fig. 2.11

45°

Fig. 2.12

Sensor Installation


Arranging Cables

Use the provided Cable Guides (Fig. 2.13) and M3x6

screws to place and fix the cable guides on the mounting

plate (Fig. 2.14).

Cable Guide

M3x6

Fig. 2.13

Fig. 2.14

Considering the triaxial configuration and the defined

directions as represented on Fig. 2.15, sensor connec

tion should be performed as on Fig. 2.16:

Sensor Installation


y

xz

B A

AB

A

B

Fig. 2.15

A

BA

BA

B

Sensor x

Sensor y

Sensor z

Fig. 2.16

Standard Accelerometers are delivered with 2 m lengthcables on each side. This is not an optimized length for

the Bi or Triaxial configuration, but connections can be

performed. Fig. 2.17 shows an assembly of sensors with

Sensor Installation


the standard cable lengths. In Fig. 2.18, an assembly ofsensors with an optimized cable length is presented.

Fig. 2.17

Fig. 2.18

Start by taking the cable B (Fig. 2.15) of the sensor on

the x axis and place it around the assembly as onFig. 2.19.

Then, take cable A of the sensor on the z axis and place

it around the assembly as on Fig. 2.20. Use an OpticalAdapter and attach both connectors.

Sensor Installation


ÖÖÖFig. 2.19

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ÖÇÇÖÖÇÇÇÇÇÇÇÇÖÖÖÖÖÖÖÖÇÇ

ÖÖÖFig. 2.20

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ÖÖÖÖÇÇÇÇÖÖÖÖÇÇÖÖÇÇÖÇÇÇÖÖÖÖÇÇÇÇÖÖÖÖÇÇÖÖÇÇÇÇÖÖÖÖÇÖÖÖÇÇÇÇÖÖÖÖ

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ÖÖÖÖÇÇÇÇÇÇÖÖÖÖÖÖÖÖÇÇÇÇÇÇÇÇÇÇ

ÖÖÖFig. 2.21

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ÇÇÇÇÇÇÇÇÇÇÇÇÇÇÇÇÇÇÇÇÇÇÇÇÇÇÇÇÇÇÇÇÇÇÇÇÇÇÇÇÇÇÇÇÇÇÇÇÇÇÇÇÇÇÇÇÇÇÇÇÇÇÇÇÇÇÇÇÇÇÇÇÇÇÇÇÇÇÇÇÇÇÇÇÇÇÇÇÇÇÇÇÇÇÇÇÇÇÇÇ

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ÇÇ

ÖÖÖÖÖÖ

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ÇÇÇFig. 2.22

Proceed in a similar way with cable B of the z axis

accelerometer (Fig. 2.21) and cable A of the y axis

accelerometer (Fig. 2.22). Use clumps to fix cabling and

connections.

Sensor Installation


2.2.3 Fixing the Assembly

The Bi or Triaxial assembly is now ready to be fixed tothe structure. The mounting base has 4 M6 holes for that

purpose. Four M6x20 screws are provided, but these can

be or not be suited for fixing the base to the structure.

The fixing method should be carefully defined.

2.2.4 Protecting the Sensors

Although the accelerometer is IP68 rated, the performed

connections on the assembly are not. This means that

for outdoor usage of the assembly arranged as above

should have the connectors protected against moistureand dust. HBM FiberSensing suggests the use of a vul

canizing tape around the connectors and adapter

(Fig. 2.23).

Fig. 2.23

For mechanical protection and external cover of the Bi or

Triaxial Assembly, HBM FiberSensing has a specially

designed cover.

It is prepared to be screwed to the surface with 8 M6x20

screws and has two holes for cable exiting.

Sensor Installation


Fig. 2.24

Sensor Configuration


3 Sensor Configuration

3.1 Sensor Calibration Sheet

Every HBM FiberSensing sensor is provided with a cali

bration sheet. The layout of this document is the samefor all accelerometers.

Fig. 3.1

Sensor Configuration


3.1.1 General nformation

Number 1 in Fig. 3.1 shows the general information on

the particular sensor, such as its type, the sensor part

number, its serial number and the production tracking

number, the FBG ID.

3.1.2 Calibration Data

The most important information related to the accelerom

eter sensor – the two central wavelengths at room temperature and sensitivity - is shown in the Calibration Data

table (number 2 in Fig. 3.1). These values should be

used for acceleration computation.

3.1.3 Acceleration Computation

Number 3 in Fig. 3.1 exemplifies the calculations that

should be performed for wavelength measurement to

acceleration conversion. The acceleration variation of an

Accelerometer, under a reference frequency, is given by

the quotient of wavelength shift from the zero moment bythe sensor's sensitivity.

acceleration � x�S � acceleration

� (WL � CWL)�S

Fig. 3.2

Where

� x is the wavelength shift in nm

� S is the given sensitivity in nm/g

� CWL is the central wavelength of the sensor at the

zero moment in nm

� WL is the measured wavelength in nm.

ww

w.h

bm

.co

m

HBM Test and Measurement

Tel. +49 6151 803-0

Fax +49 6151 803-9100

[email protected]

measure and predict with confidence

A4265-2

.3 7-2

002.4

265 H

BM

: public

installation guide - s3-ap-southeast-2.amazonaws.com · technical details fs65 a4265-2.3 hbm:...

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